I have a custom grouping summary for a particular column (Lets call it column A). I set the properties (formatting, forumla, etc) in the "InitializeLayout" event, but when the grid loads up column A does not show any grouping summary for that column (even though I know for sure that my custom function gets called). I also rigged up a button on the form to add more grouping summaries to the grid when pressed, when the extra summaries are added column A finally shows the grouping summary. Why does it do this? I want column A's grouping summary to appear right when the grid is loaded with data.
I submitted an incident report on 17th September 2008. This is apparently "working as designed" (the old classic :-). However a future feature request has been entered to get custom summaries to be included as part of a grid layout.
If anyone is interested, I managed to create a clunky workaround which basically does the following:
1) Before saving layout, turn all custom summaries into standard "Sum" summary types instead.
2) After saving layout, switch summaries back to custom
3) After loading layout for the grid, change all the summary types to custom.
Of course I was lucky that in my case, all the summaries on this grid are custom and use the same custom evaluator. If you have a mixture of standard and custom it will be a bit more complicated.
I'm experiencing the same behaviour, I am using the 2008 volume 2 version, 8.2.20082.1000.
What version of the controls are you using? This sounds like a bug to me. You should probably make sure you have the latest Hot Fix and if that does not help, Submit an incident to Infragistics Developer Support. If possible, include a small sample project that demonstrates the problem.